Utilization of linear prediction procedures to evaluate animal response to grazing systems
Issue Date
1990-09-01Keywords
liveweight gaincalves
continuous grazing
progeny testing
breeding value
best linear unbiased prediction
genetic effects
responses
environmental factors
heifers
rotational grazing
diets
cattle
grazing
New Mexico
Metadata
Show full item recordCitation
Winder, J. A., & Beck, R. F. (1990). Utilization of linear prediction procedures to evaluate animal response to grazing systems. Journal of Range Management, 43(5), 396-400.Publisher
Society for Range ManagementJournal
Journal of Range ManagementDOI
10.2307/3898998Additional Links
https://rangelands.org/Abstract
Best linear unbiased prediction (BLUP) procedures were used to separate genetic merit from environmental effects on 205-d weight (205-d wt) of calves produced by cows grazing 2 pasture systems. Phenotypic measures of 205-d wt were statistically partitioned into genetic effects (breeding value) and environmental effects. Means were regressed on year of birth of calf. Analysis of covariance was used to test difference in slope and elevation (means) of the regression lines. The continuously grazed pasture (CC) produced higher 205-d wt than did the rotationally grazed pastures (RG) (P<.10). Rate of change in 205-d wt was similar in the 2 grazing systems. Genetic merit was similar among the animals in the 2 grazing systems. The rate of change per year in genetic merit (genetic trend) was also similar. Means tended to vary sharply from year to year, indicating inequality of genetic merit should be taken into account in this type of data. Mean environmental effects resulted in greater (P<.10) 205-d weight in CG than in RG. Rate of change of environmental quality was similar in the 2 systems. These results indicate, from the animals perspective, the RG system did not improve productivity when compared to CG. The CG system was of higher nutritional quality, but the rate of change was similar to that of the RG system.Type
textArticle
Language
enISSN
0022-409Xae974a485f413a2113503eed53cd6c53
10.2307/3898998